Take your ride to the next level with the Edge 305 - Garmin's GPS-enabled, personal trainer and cycle computer. From competitive road racing to mountain biking, the cyclist-friendly, lightweight Edge will help you achieve your personal best. With the easy-to-use Edge 305 on your bike, you'll always know where you're going and how far you've gone.For advanced cyclists, the Edge 305 comes packaged with either a heart rate monitor or wireless speed/pedaling cadence sensor to provide valuable feedback. Heart rate and speed cadence are also sold separately as accessories so you can incorporate both features into your training. In addition, the Edge 305 incorporates a barometric altimeter for extremely accurate elevation and vertical profile data. Recreational cyclists looking for the perfect touring companion and fitness partner will love the Edge 305.The Edge 305 with cadence includes a self-calibrating, wireless speed/cadence sensor so you can monitor your pedaling cadence as you ride. Like the heart rate monitor, the speed/cadence sensor uses the same robust wireless technology to measure and report your pedaling strokes per minute.With its waterproof, sleek design, the Edge is the perfect companion on any bike, and attaches to either the stem or handlebars. Its rugged case frames an easy-to-read, large, backlit display that can show up to eight different data fields along with altitude and a map view.